GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Did you perform the Lighting System Diagnostic System Check?

--

Go to Step 2

Go to Diagnostic System Check - Lighting Systems

2

Disconnect the headlamp/instrument panel (IP) lamp dimmer switch connector.

Do the lamps turn off?

--

Go to Step 3

Go to Step 4

3

Replace the headlamp/IP lamp dimmer switch. Refer to Headlamp Switch Replacement .

Is the repair complete?

--

Go to Step 8

--

4

Disconnect the daytime running lamps (DRL) control module.

Do the exterior lights turn off?

--

Go to Daytime Running Lamps (DRL) Headlamps Inoperative

Go to Step 5

5

Disconnect the theft deterrent relay.

Do the exterior lights turn off?

--

Go to Step 7

Go to Step 6

6

Repair a short to B+ in CKT 9.

Is the repair complete?

--

Go to Step 8

--

7

Refer to Diagnostic System Check - Theft Deterrent in Theft Deterrent.

Is the repair complete?

--

Go to Step 8

--

8

Operate the system in order to verify the repair.

Did you correct the condition?

--

System OK

Go to Step 2